Convert AVI to MP4

How it works

1. 1

   Add your AVI file

   Drop, pick, or paste it. It stays on your device.

2. 2

   Convert

   We re-encode it to MP4 right here in your browser.

3. 3

   Download

   Save the MP4 file.

AVI is the one where a real conversion is unavoidable

Most container swaps are a formality, because the video inside is already something modern. AVI is the exception. It is a container from 1992, and the files that are still in it tend to hold DivX, Xvid, or MPEG-4 Part 2 video, codecs that had their moment around 2005 and that browsers and phones have no interest in decoding today.

That means the video really does have to be decoded and re-encoded to H.264, and there is no shortcut that avoids it. It takes longer than a rewrap, and it costs a generation of quality, which is simply the price of dragging a file across twenty years of format history.

It is worth setting expectations about the result. Old AVI files are often 480p or lower and were compressed hard to fit on the discs and connections of the day. Converting to MP4 makes them playable everywhere, but it cannot put back detail that was thrown away in 2005. If it looks soft afterwards, it looked soft before.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

Why does this take longer than other conversions?

Because it is a genuine re-encode. The old codec inside an AVI has to be fully decoded and compressed again as H.264, which is real work, unlike a container rewrap.

Will the MP4 look better than the AVI?

No. Converting cannot recover detail the original encode discarded. It makes the file playable on modern devices, which is a different thing from improving it.

Can I remux an AVI instead?

Almost never. The codecs typically found in AVI files are not ones MP4 can carry, so the streams cannot simply be moved across.

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